package com.penghk.springbootdemo;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ThreeConditionCommunication {
    /**
     * @param args
     */
    public static void main(String[] args) {

        final Business business = new Business();
        new Thread(
                new Runnable() {

                    @Override
                    public void run() {

                        for(int i=1;i<=4;i++){
                            business.sub2(i);
                        }

                    }
                }
        ).start();

        new Thread(
                new Runnable() {

                    @Override
                    public void run() {

                        for(int i=1;i<=4;i++){
                            business.sub3(i);
                        }

                    }
                }
        ).start();

        for(int i=1;i<=4;i++){
            business.main(i);
        }

    }


    static class Business {
        Lock lock = new ReentrantLock();
        Condition condition1 = lock.newCondition();
        Condition condition2 = lock.newCondition();
        Condition condition3 = lock.newCondition();
        private int shouldSub = 1;
        public  void sub2(int i){
            lock.lock();
            try{
                while(shouldSub != 2){
                    try {
                        condition2.await();// 释放了锁
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                for(int j=1;j<=20;j++){
                    System.out.println("sub2 thread sequence of " + j + ",loop of " + i);
                }
                shouldSub = 3;
                condition3.signal();
            }finally{
                lock.unlock();
            }
        }


        public  void sub3(int i){
            lock.lock();
            try{
                while(shouldSub != 3){
                    try {
                        condition3.await();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                for(int j=1;j<=30;j++){
                    System.out.println("sub3 thread sequence of " + j + ",loop of " + i);
                }
                shouldSub = 1;
                condition1.signal();
            }finally{
                lock.unlock();
            }
        }

        public  void main(int i){
            lock.lock();
            try{
                while(shouldSub != 1){
                    try {
                        condition1.await();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                for(int j=1;j<=10;j++){
                    System.out.println("main thread sequence of " + j + ",loop of " + i);
                }
                shouldSub = 2;
                condition2.signal();
            }finally{
                lock.unlock();
            }
        }

    }
}
